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EUIVALENT AREA: 24,000mm² (240cm²) per set (tested to BS EN 13141-1:2004 and independently verified by the BRE).

Telescopic cavity liner set with external cowl for ventilating boilers, stoves and fires. HETAS approved for use with solid fuel appliances.

Cowl protects against excessive weather conditions and alleviates air blasts through the cavity. Contains a system of internal baffles to reduce light and draughts.

Finished with a fixed open louvre ventilator internally. External water baffles prevent transfer of water across the cavity. Cowl, air brick and louvre grille U.V. stabilised to slow down the effects of sunlight.

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